Rockwell Automation 1757-FFLD Linking Device Configuration Manual - Manual (Page 147)

Publication 1757-PM002A-EN-E - June 2006
Glossary 5
Transducer Block
(TB) Decouples Function Blocks (FBs) from the local Input/Output (I/O) functions required to
read sensors and command output hardware. Transducer Blocks (TBs) contain
information such as calibration date and sensor type. There is usually one TB channel
for each input or output of a Function Block (FB).
Transmitter An active fieldbus device containing circuitry, which applies a digital signal on the bus.
Trunk The main communication highway between devices on an H1 fieldbus network. The
Trunk acts as a source of main supply to Spurs on the network.
Virtual
Communication
Relationship (VCR) Configured application layer channels that provide for the transfer of data between
applications. FOUNDATION fieldbus describes three types of VCRs: Publisher/
Subscriber, client/Server, and Source/Sink.
Term Definition